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Speedo sensor testing 700

posted by  david hunter on  Tue Oct 1 11:13 CST 2002
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last visit: Mon Jun 30 22:10 CST 2014
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It is much easier to test for a signal from the sender. This can be intercepted at the speedo plug while it is disconnected. Look for an AC pulsing signal across 2 of the wires the 3rd wire is a ground. Itincreases in speed and voltage as the diff turns. Voltage will start out low (around 1V or so if i remember correctly and rises a bit as speed increases but the speedo looks at frequency and ignores the increasing voltage. I have tested for this signal with wheel in the air and while driving. Use an analog meter set to low AC voltage range and you should see the needle moving.
--
David Hunter






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